Concrete building construction.



NTTED STATES FATET TFTCE.

ALBERT S. REAVIS, OF WASI'HXGTON, DISTRICT OF COLUMBIA.

CONCRETE BUlLDlNG CONSTRUCTION.

Specification of Letters latent.

Patented Feb. 12, 1907.

Application filed October 29.1906. Serial No. 341,111.

following is a specification, reference being 1 had therein to the accompanying drawings.

This invention relates to concrete building construction, the object of the invention being to provide a novel construction of bar adapted to be used as a core to be embedded in concrete, the said bar being of such crosssectional shape that the concrete when han dened around the bar will be prevented from slipping on the bar, even though said com crete become loose on the bar, duc to constant jarring and Vibration, or from any other cause.

With the above and other objects in view the invention consists in the novel construction, combination, and arrangement herein fully described, illustrated, and claimed.

In the accompanying drawings, Figure 1 is a plan View of the bar, shown embedded in concrete. Fig. 2 is an enlarged plan View of the same. Fig. 3 is a cross-section through the bar. Fig. 4 is also a cross-section through the bar, with the longitudinal fluting or corrugations omitted. Fig. 5 is e plan view ot' the bar, showing the transverse ribs with rounded peripheries.

The bar contemplated in this invention is solid and substantiallyI round or cylindrical in cross-section, as shown in Figs. 3 and 4, and in the preferred embodiment of the invention the outer surface of the bar is longitudinally corrugated or tinted, shown at 2, the main solid body of the bar being indicated at 1. These corrugations are parallel with one another and extend the entire vlength of the bar. with the exception ofthe places where they are interruptrxt by transverse circumferential ribs 3, which form shoulders against which the concrete finds a bearing when the latter is hardened around the bar.

The transverse circumferential ribs may be arranged at any suitable distance apart and ,may be of any desired width. Under the preferred arrangement the said ribs 3 project outward beyond the outer edges of the corrugations 2, as clearly shown in Fig. 3, and said ribs are parallel-sided, the sides being at right angles to the cerrugations or .flutes 2 and 'forming square shoulders against which the concrete abuts and hardens. 1f desired` the cuter edges of the ribs f may be rounded off, as shown in Fig. 4; but ordinarily it will be found expedicnt't-o leavesaid ribs with flat cuter edges or periiliheries, as shown in lfig. 3.

By extending the ribs 3 outward beyond the extreme outer edges of the corrugations each transverse or circumferential rib 3 affords a contimious annular shoulder onboth sides for the concrete On account of the regularity of the bar in cross-section and the small size of the longitudinal corrugations there is no liability of the bar to fracture or break up the concrete should torsional strain be applied to the bar causing it to turn in the concrete. There the bar is liable to be subjected to excessive torsional action andthe fact is known beforehand, the corrugations or Iluting may be omitted, as shown in Fig. 4.

The bar hereinabove describedmay be nnmufacturcd cl'ieaply, and in the ordinary concrete buildingr construction there is no liability of relative sliding er slipping and turning movement between the bar and the concrete surrounding the same,

l. A bar adapted te be used, as a core to be embedded in concrete, comprising an integral body having the` outer'surtace thereof longitudinally iluted, and circumferential ribs interrupting the flutes and forming continu-` ous annular shoulders for the purpose set forth. i

2. A bar adapted te be used as a core to be embedded in concrete, comprising a solid body havingr the outer surface thereof longi-A tudiually Iluted, and circumferential ribs interrupting the longitudinal flutes and eX- tending outward beyond the same and forming continuous annular shoulders for the purpose set forth.

1n testimony whereof I aflix my signature in presence "rf two witnesses.

. ALBERT S. REAVIS.

Witnesses Kantone M. Sn'rrn, A. M. Parrains. 

